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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ed694a324b0b2e3492acd790306a197595ce53b520e9ba09d2871bd89190bc' 
  AND token = 'JldzieesIa0cUI8E0JYykbytfIluU2s+ipwZn2piLgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}