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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73117e06b3b5ec9f87b13c311105e8ddfaf4676d39e9f99d132b7b94bb888b7' 
  AND token = 'ja8toKge/0qfU0tnjXAXab0ZM3Mlj8zjKY9Yfhdm/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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