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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e030dfa1c85e33bca23c83a55c90e04ad6e4f50004f0b8e358275a6c638c3c91' 
  AND token = 'jo2GzXjLlXE1zc9PU/EpZPF3yCwYg0+I7+YpmYaAkpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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