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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bc516063932586f662341b1f6b6afa3278607ef88593a03f7e1d0e23aeaa4e' 
  AND token = '2MpVCEFhHqqhCdCgGCVs50CD9oYm0Pr0KN0BaUVuI+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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