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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcd0e9da853920930343aff99e61c151c18cd20ea59011b540484a1b01d469b' 
  AND token = 'lAuXOyUNymnxhsydA2FRAT7PmKLuZj4jJfi1r4+66po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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