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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df058aa8bfc07b77187f64c6f3062216c975c287f195e8c96afd0521a6c1af7' 
  AND token = '+kXHdbu4tLKzzaCWlbOVrXNe6S0et6gZxx6hy0hsRDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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