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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285111e7b26070c9a0ddd065fb0e41146e4973b8113bf71703660848bdc6bba4' 
  AND token = '0XlNW1XpaIfBZg1pjOuCo8u4eq97lpt3DGbwASVipKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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