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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f099da28e89267a79cd65da50f597d73b373d136e154bb279a754e1fcc7a278a' 
  AND token = '1Q6K+yxwKmABinLSDOzHgHOyYdvWkW/10V71DCL0lyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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