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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee34594d42fe58a525d535d3d00b1190b1dfb9fbc5a8fd44ec6f09ee4bcf9848' 
  AND token = '8uQHmvPV22fKkZtCi/Kfwhn0NoQKWkVA/BkwdIZ7Uv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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