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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33012c87fc88bf7ac11d00da1524ead7cffa642916e09354422ba30319e786be' 
  AND token = 'k53BuJt7ZbY1xWHqKr+dD67ASN6itf7tBcRH1P3uS3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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