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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1c20d5f56663b4ef6b51441e9ab31caafc375de6328aaacf9d6716e37d6a3' 
  AND token = 'uW/CzpdhvTiFkljAE2qqNjLAisciM1Bai3FwHIkb7yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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