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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9cd782aa1a1ff0574d1292a5f0240e9c453842ab46763443d14c5525a6aa28' 
  AND token = 'vIh2gg7KabCe/nW7jdb+AfKgCYcj4wzlQkFIhyMOkAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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