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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fa268a33f2e647f24f62759208a53ecb52f45c088e97aef344e7b8661cfc15' 
  AND token = 'pzx2E4HQZ4ZI8p6rufYFN9iA6nFhaYasLzx7j2fZW4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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