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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a31a21f33b18fc8d1dfc7fd63b895189bb6ef8ef81ca42a53c5670f52a60ea' 
  AND token = 'RjtLJzVXsI1gEWIpaMH0vyPcKFsdf5l7Bcf9XrAocvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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