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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008d5474496cd14eb6a3b12d5541a14db6c1d2b7023ed4f979dfa2bdb9bde7c2' 
  AND token = 'fwA28URROzPgO/ldJA2U6TQN63FaGdPAdju4tJDCkTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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