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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89efbd1539e0066271a46668abbc3c72328df0b182eb49c84b3b8b602ef342e' 
  AND token = 'tndObeyQssNWk0m5pwEZv3oD39kytKwfSUYmSQlNJmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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