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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15679932d5ed1dd66b55ad73d22b1a5c590e0628599bff3a23c8be474586844' 
  AND token = 'OhzV9PhcFo+6l+phS5SuYI3vu6n5ghoZdK26EN6ptUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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