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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee42efa1587b66cffa8a340d5451827b80d13ab25c37ff0019c5e554a97d56e' 
  AND token = 'mlKBKuvvP6X7p78CEOb6R5AcMj6IO0X9wKdo1VjxAY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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