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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f658a6f0d893dabe23ae7bc779288276abd4ef76f58bb7b1334a3e6e1c62c387' 
  AND token = 'QGprIs8ESJaNkcBhyp5UFWI46WQdZPpkWS6pGEyvN7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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