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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b879e5416e264a498239f85312cf263fd53667886e9d2bc33acc54a35c66e58' 
  AND token = 'KABLtrXhjt9in8leiaS0dyCTlelQnFTl/gK3apZPtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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