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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fd30e7c2b0a4afadc1a962b8bcd39297e1e9094ba145113686380aa195ac7d' 
  AND token = 'RyVGLx557Sj1MqMUY8inHxBUsAfJoEiTgm289GyPSS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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