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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cddeaefa393e03c44f35b4a3d9d8c58ff5146bde40795a27ae4bc352508fc8' 
  AND token = '3p6Xl474nOFalb5PGLxTZRNXXuqQpE2IEQoJK33ujgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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