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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf8e4e5e964d0bca9aab4bd384608de3c4b382bba5fa01067b0bc343c3fd97e' 
  AND token = 'KDoRa/mZmX3G9oGXk29/9ENAB4KSpcmeHobXG/SeFLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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