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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a119a0e783152b4cb08a744c17bd3228e9d1be44227001c46606f40bad83beb0' 
  AND token = 'QQXBZ01rwOjBet8zOZ4mVzFsrceG0IOJkE3KVXreB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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