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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1c3576ed83e25ed8cdeca3d5423e114b337f79b1f71e0dde01ad06afd526fb' 
  AND token = 'LomJAIpyLyxZR7Sy+JjuftfCF3lTa7TcqtAptGYKmcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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