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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39886cd86ff967ecaf1ce32aed998e0f3d69cf267a3a9e11d4bba0f84251bf6c' 
  AND token = 'pQft3E7jp0bnYl6khFuvUne43Z4EMXXU8nRZDIoG7aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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