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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e3cca28ff892dff6af503080d30b34faa9ce181620e38ff28eec02c5672461' 
  AND token = 'GQrEfrNBDbZr0TB07T+jOC5CEl0cKv5g9obc2Ss7V98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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