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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3e4c019971986fc703301e9d526a9fb75ee2644c227d423ea9a8c80b06fc84' 
  AND token = 'br8lp5vWkCyPBYKGLxGvkvocX4e/v4AK/JQaG547hmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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