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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c355b3659abc0b8b58298c13a3823b5ee6e16ae5fcff74026dc5f21508f8824' 
  AND token = 'Ir8KZYUFcQJ47itkBpA61yNoClGpgh5Q8znOCz8fLUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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