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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd639d09a165a0831cfee55c1168f8a73c99fe9b7104979b56745d3f923a656a0' 
  AND token = 'ssriRbvPuRBE7Y1FAfoR/dfnO4F5avUaiBw4zEQlQp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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