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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4159772ffd5e99dd757818ab7c33c28b03c09958bc80e5d0484f7f377bcf24c' 
  AND token = 'uNSgIcKNsiRhbFuxmOTp7HXgWBVYZ5FICTxX0a2rH6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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