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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7313992255fe83e9a29d21fe783ac1ed310fb977d3b3ae7c14dde3724f1ee60' 
  AND token = 'd9W6TMKGfdH+IXOn5t//MOM0AupMehbgVbcaPljbWoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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