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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88686778763b3c6b80619ecee915ca1e05f4b77f9eb1cb482a3bb9fd26da639' 
  AND token = 'J81EBjXiFRLjEeaMTGb8cGM9JPbHzva1REk21fW8T8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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