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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4855b6427fa199a85c025f29db0bf0f16eed69a9361a2a136ce050aae2b1a949' 
  AND token = 'fYYlieelURlleStHPfeGYx+JZW/L2wvyzNYSioT/flM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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