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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ba67cc224c0dcab01ed5c072b38eaab31b0172dc1b7b5437c5fb48d193d5a1' 
  AND token = 'D8yDDqXQj1murlD7i9KGVQGVY3NcygSBKaptQDPcCuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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