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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8c015b602b8aa65c1548d65671a7ad36350cf5071aef388f68a07937e80f82' 
  AND token = 'pWxRLMDuBaDrJn0aVmELP9aytv1cc0Hn40v1uaOdM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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