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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6137afbe9b7c70a8061a29eebbd18f16672570fb840c0f3dda8968730981e7' 
  AND token = 'hIe5inlqsLxE+ghk4h36sWOWYPQeXVEimROm0vX8JXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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