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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fb61155ad3198d756b4b11a72388ae5ae75c3716b9b9be080216a52f023139' 
  AND token = 'z3tjUbYxsCQDByTzjJU6IMC2skoelcj81mH7kOSbUO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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