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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c188a99f6443dad19d42fb32364ffb2af6b3a69e986111eeafb0f42164d45e' 
  AND token = 'aNb29oVVuQCI95qqS3GIs4Q9GpPP0zGXa76M8kmEyGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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