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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb241268fc4e4871a8e1248eddfbd7158aa245d67ed7f863a91e7296b0a4eaaa' 
  AND token = 'uAVGf4wybt9pXpeCHANA/fXfHWA9sfNlcUJbvfVUzRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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