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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab6adea7499d8e901fe544de66e3683b6b9d5947bf2c7e5a5757006bf400b59' 
  AND token = 'GjP15wmKloslcVbP1k4yKY9Vur5FSsrAaYCZzmCO2Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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