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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e6c74f1d560aa7e8eeb571d3dfec7e2fa9366650878b67bc677420afdb423a' 
  AND token = 'cYaIumKikMQPYXHIKF24dx0tqpdCKYOBMi3bagC60iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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