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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740f1caf06cc76fe00c793b5df64fb2e291fbac296991b1c5e17f34ec52a2aab' 
  AND token = 'CgHYsCS0PS+CzYAtxpc12oEfD1iIvk1CEwa0xkMP200=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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