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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b377c8be13dc00fecf819e403b4edc873cefcea5aeb86fbe79fd4d5f8c6d15' 
  AND token = 'nFcz7XfJXR63eI5O4OC4Q8ztTOjjzvDED+JwGp+Kc54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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