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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa4170982169c61b4a7f5f8a4da994f32ea803779bcaf9e224219d48a93ecab' 
  AND token = 'boUU9tXIFkqdWJ2VukvBRvrxySAgT8WU1bMhi3CWlW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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