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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91846daeae66a65bb3ea548c2b1c70f2845f359ee465a5e5e02c7fc92e43cfd0' 
  AND token = 'xu9fmzujA+cs6/OuYDC/ki2FRKNXbx5BTOgd1+mFit4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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