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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1bc41e43e1edddbd5964659a941a24dd367cbd8012ecd932aea614b1e6ab31' 
  AND token = 'd3ZruJ6iDskmsgipx49sBlCsxaU/DHNbr9fPhy750XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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