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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b40d2d4f6391d3f37bd48419da284c6a76b7ba1551ba054c5dbfeeed8d2e08' 
  AND token = '5ieC1syE62EbPhPdZhgg3seB2oDkjjIQCbIQZH6GYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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