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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef33479aafb940aa614227c64c6ed8c02b0eaf621b90dcfb13b2684bb5b030ae' 
  AND token = 'ZCQIpy2FOq2IZzSIo5pCH//zYrKFIocjRPYZ1uMztac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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