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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140a6d3d80083577980612108f1b11b64bb15a48e44288425bf1d64b1314face' 
  AND token = '/OjfVyqJu6xoR5M3zTfhfdi8K8te+ETQHJ9ljUatqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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