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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6cd5658237b98f1a7f2f387ed14b8fbda83413626e5b09341e29201a6d5f6d' 
  AND token = '2yhKKxNk7iLlfLeVetqxLFFnV7LunubTON04CrZJbxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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