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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debc32e37b14bbf28c486e9dd35475db1ccb0a0f0014241cd8a0367e170866e7' 
  AND token = 'o3lEm4nYU7qnNDSowZi/Lr26CJtv7oIZVyfeQDi5k9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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