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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb66b051fbbaf9bad4393c04b6e4993f70710cc97ce6c5e7235a71504626bbd' 
  AND token = 'Ldgc+7Bfc2HU9eJROZyGEQem1yiiUeF38xhU/LocrdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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