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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4ecc290c99670ae1f4479a899e58ae95a7ca1fc24769344ecf0bba87c97b61' 
  AND token = 'Am+dioR/Ml7eYw+HfPF4oWf+cpJGpQYuh1gX5eibKKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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