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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47a633eae059fd8310cd875f9d9f75478f1171cb2554645dd09f81a1e885e01' 
  AND token = 'AQmb9m1JWrceInRXutzl3bBTrfvLgP/yn5W3Dx+MlLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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