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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8daf484ed6bdfb0669c8abf5a4584fd9838c4772b2b2fdd2471ae51f11476b' 
  AND token = 'SfWtZVDMV2MP9mX8QNulmzR6M6Sxwzivo3pdzuLqNrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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