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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a383ead86685fba5ce311878d272164b771ee798ba4fb0a6750daab0f6ce65d' 
  AND token = 'fLFFES2IpkqgChPLQgor3k6qbz6j3g7QlozqaHA3f58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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