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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd15593f7e3114f96393c39feddc35817c81bbfdc1f7b56fdb7db28ffbbcd1a' 
  AND token = 'gZLes8rk5/lS3thcYLQC3PQy4ifIMZWYkS7nPIRVGMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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