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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62297e3d7078a2a85ba464355308edde1d9ded1178d2454e443e981608282d02' 
  AND token = 'UcBkx/p0yKJfmnLmDVO9+ql6yo3rTMVbvvxVdHq9b0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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