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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa64a0aede5e9fb0bdcec385bb48dcfbaf53886a9a6b8da0247524f41cc3515f' 
  AND token = 'SlaNn4/Np9f4ysgq3clwDVRq8unw8WxYl4n2ENizLqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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