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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d459bf40a9b499450b9e9157ef146106e9c20b4742b12cecd213746a00109f' 
  AND token = 'fThW3tmb/1DyH4MJq7Bxc2I6Nlbt1IAvgyooo4FR8+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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