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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a6f2b7d9f945a7ab16709885dad49e098627206c7df9d8a7e73dfdb45219c0' 
  AND token = 'Lkj9VypbYW/fH4V5BVUZ8yuSecm05i7t9Y2fF0BcpWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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