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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c402226d15877d24ec9bd88fb1fec7c52d9301aca4f90ad01b81933341b302' 
  AND token = 'OXV22uKueSY1HzarL907E+wbZk6qJpRa3SjXyN+T4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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