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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29dd45080f080a6a331d322ea3a90cf9dbd031da2cc1b66eac5d1f7c2299e9c' 
  AND token = 'cfCBzdOnNR+4+9Ps0X7nIIxRQQ6Y/fCwN25s0oopJt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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